Abstract
The concentration of oxygen in liquid copper has been investigated by the solid-electrolyte galvanic cell Pt|Ni-NiO|ZrO2+11mol% CaO|O(in Cu liq.) |Mo at 1473 K under high vacuum for the concentration range of oxygen down to less than 1 ppm. Alumina and graphite, are used as crucibles for melting of copper. CuO addition into liquid copper and subsequent hydrogen reduction of it are carried out in alumina crucible. Oxygen concentrations determined by analysis and calculation were compared with each other. Results are as follows:(1) Oxycell probe used in this work generates stable e.m.f. under high vacuum as well as under atomospheric pressure.(2) Calculated values from e.m.f. values show precise oxygen concentration in the liquid copper down to about 1 ppm.(3) The oxygen concentration of less than 1 ppm can be measured in the melt with stirring.
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